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प्रश्न
What are the four main forces which contribute to the ascent of sap (upward movement of water and minerals) ? Name them and explain in short.
उत्तर
- Perhaps sufficient for herbaceous plants, root pressure accumulates enough force to push the sap in the xylem vessels up to a certain height.
- The capillarity (narrow diameter) of xylem vessels permits the water from a lower level to rise to make up the vacuum produced by the loss of water owing to transpiration from the leaves.
- Pull with transpiration. The tendency of water molecules to remain linked (cohesion) pulls more water molecules up when the water is lost from the leaf surface by transpiration, therefore producing a continuous column of water through the stem.
- Attaching. It draws more water molecules from below when the leaf cells lose water during transpiration since it makes the water attach to the surface of the cells.
संबंधित प्रश्न
What is transpirational pull?
Very short answer question.
Which type of plants have negative root pressure?
Very short answer question.
In which conditions transpiration pull will be affected?
Answer the following question.
Discuss theories of water translocation.
Answer the following question.
Define and or explain the term:
Ascent of sap
Oozing of sap from the cut end of herbaceous plants is due to ____________.
Root pressure theory was proposed by ______.
Attraction of water molecules to polar surface is known as ______.
In vascular plants, growth takes place due to
Arrange and rewrite the terms in group in correct order to be in a logical sequence, beginning with the term that is underlined:
Water vapour, Soil water, Leaves, Ascent of Sap.
